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Message: <blockquote data-quote="MacInWin" data-source="post: 1694534">Jack, that's easy to create. Imagine a flaky cable that works 90% of the time. You boot, the system detects the reader and all is well. Now the cable flakes out and the card reader disappears. That disappearance is noted by the system. But it's not designed to keep testing to see if it comes back. It's gone, so it's gone and noted as being gone. So now you reboot and the 90% probability is that it's there, so it reappears, at least until the cable goes south again. So a reboot CAN fix a hardware problem, sort of.EDIT: Has your Mac ever been opened? Serviced? I ask because perhaps the technician didn't put the cable back firmly, or damaged it somehow in the process. Just sort of a shot in the dark, but that's mostly how cables go bad.</blockquote>